// Copyright (C) 2020 THL A29 Limited, a Tencent company.  All rights reserved.
// Please refer to the license text that comes with this tendis open source
// project for additional information.

// "License": Public Domain
// I, Mathias Panzenb?ck, place this file hereby into the public domain. Use it
// at your own risk for whatever you like. In case there are jurisdictions that
// don't support putting things in the public domain you can also consider it to
// be "dual licensed" under the BSD, MIT and Apache licenses, if you want to.
// This code is trivial anyway. Consider it an example on how to get the endian
// conversion functions on different platforms.
// https://gist.github.com/PkmX/63dd23f28ba885be53a5

#ifndef SRC_TENDISPLUS_INCLUDE_ENDIAN_H_
#define SRC_TENDISPLUS_INCLUDE_ENDIAN_H_

#if (defined(_WIN16) || defined(_WIN32) || defined(_WIN64)) && \
  !defined(__WINDOWS__)

#define __WINDOWS__

#endif

#if defined(__linux__) || defined(__CYGWIN__)

#include <endian.h>

#elif defined(__APPLE__)

#include <libkern/OSByteOrder.h>

#define htobe16(x) OSSwapHostToBigInt16(x)
#define htole16(x) OSSwapHostToLittleInt16(x)
#define be16toh(x) OSSwapBigToHostInt16(x)
#define le16toh(x) OSSwapLittleToHostInt16(x)

#define htobe32(x) OSSwapHostToBigInt32(x)
#define htole32(x) OSSwapHostToLittleInt32(x)
#define be32toh(x) OSSwapBigToHostInt32(x)
#define le32toh(x) OSSwapLittleToHostInt32(x)

#define htobe64(x) OSSwapHostToBigInt64(x)
#define htole64(x) OSSwapHostToLittleInt64(x)
#define be64toh(x) OSSwapBigToHostInt64(x)
#define le64toh(x) OSSwapLittleToHostInt64(x)

#define __BYTE_ORDER BYTE_ORDER
#define __BIG_ENDIAN BIG_ENDIAN
#define __LITTLE_ENDIAN LITTLE_ENDIAN
#define __PDP_ENDIAN PDP_ENDIAN

#elif defined(__OpenBSD__)

#include <sys/endian.h>

#elif defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)

#include <sys/endian.h>

#define be16toh(x) betoh16(x)
#define le16toh(x) letoh16(x)

#define be32toh(x) betoh32(x)
#define le32toh(x) letoh32(x)

#define be64toh(x) betoh64(x)
#define le64toh(x) letoh64(x)

#elif defined(__WINDOWS__)

#include <windows.h>

#if BYTE_ORDER == LITTLE_ENDIAN

#if defined(_MSC_VER)
#include <stdlib.h>
#define htobe16(x) _byteswap_ushort(x)
#define htole16(x) (x)
#define be16toh(x) _byteswap_ushort(x)
#define le16toh(x) (x)

#define htobe32(x) _byteswap_ulong(x)
#define htole32(x) (x)
#define be32toh(x) _byteswap_ulong(x)
#define le32toh(x) (x)

#define htobe64(x) _byteswap_uint64(x)
#define htole64(x) (x)
#define be64toh(x) _byteswap_uint64(x)
#define le64toh(x) (x)

#elif defined(__GNUC__) || defined(__clang__)

#define htobe16(x) __builtin_bswap16(x)
#define htole16(x) (x)
#define be16toh(x) __builtin_bswap16(x)
#define le16toh(x) (x)

#define htobe32(x) __builtin_bswap32(x)
#define htole32(x) (x)
#define be32toh(x) __builtin_bswap32(x)
#define le32toh(x) (x)

#define htobe64(x) __builtin_bswap64(x)
#define htole64(x) (x)
#define be64toh(x) __builtin_bswap64(x)
#define le64toh(x) (x)
#else
#error platform not supported
#endif

#else

#error byte order not supported

#endif

#define __BYTE_ORDER BYTE_ORDER
#define __BIG_ENDIAN BIG_ENDIAN
#define __LITTLE_ENDIAN LITTLE_ENDIAN
#define __PDP_ENDIAN PDP_ENDIAN

#else

#error platform not supported

#endif

#endif  // SRC_TENDISPLUS_INCLUDE_ENDIAN_H_
